You can always send the promoter an ask if you’re worried about shooting! 17-50mm 2.8 and flashgun. wider lenses tend to look better for crowd shots, but my friends Natalie and Nate are exceptions to that rule, so basically do what you want! don’t use direct flash, bounce it off the ceiling. don’t be scared of getting hit or getting your kit broken at a hardcore show, because a) the best place to shoot from is always going to be somewhere you might get hit, and b) i’ve shot far too many bands to count and never had a broken camera or been close to seriously injured.